'use strict'
const { log } = require('console')
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Admin Template' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 9528 // dev port

//  process.env  获取环境变量对象
//  console.log(process.env, 8888)

// All configuration item explanations can be find in https://cli.vuejs.org/config/
var externals = {}
// let cdn = { css: [], js: [] }
if (process.env.NODE_ENV === 'production') {
  // 判断是否是生产环境
  //  表示上线===使用插件去除console
  externals = {
    /* 属性名：包名  属性值：包里面的顶级对象
    jquery:'$';
    $('').html()
    */
    /**
     * externals 对象属性解析：
     * '包名' : '在项目中引入的名字'
     */
    vue: 'Vue',
    'element-ui': 'ELEMENT',
    xlsx: 'XLSX'
  }
  // cdn = {
  //   css: [
  //     'https://unpkg.com/element-ui/lib/theme-chalk/index.css' // element-ui css 样式表
  //   ],
  //   js: [
  //     // vue must at first!
  //     'https://unpkg.com/vue@2.6.12/dist/vue.js', // vuejs
  //     'https://unpkg.com/element-ui/lib/index.js', // element-ui js
  //     'https://cdn.jsdelivr.net/npm/xlsx@0.16.6/dist/xlsx.full.min.js' // xlsx
  //   ]
  // }
}
/* 根据环境变量来判断是否需要做排除 */
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: './',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    proxy: {
      //  proxy 属于webpack的
      // 只要请求地址中有/api  就会进入
      '/api': {
        //  代理服务器就会向目标服务器发送请求
        //  localhost:8888/api/sys/login===>http://ihrm-java.itheima.net/api/sys/login
        // target: 'http://ihrm-java.itheima.net',
        target: 'http://ihrm.itheima.net',
        changeOrigin: true //  允许跨域
        // pathRewrite:{ //  重置路径
        //   '^/api':''
        // }
      }
    }
    // mock
    // before: require('./mock/mock-server.js')
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.

    // 配置单页应用程序的页面的标题
    name: name,
    externals: externals,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])
    // // 注入cdn变量 (打包时会执行)
    // config.plugin('html').tap((args) => {
    //   args[0].cdn = cdn // 配置cdn给插件
    //   return args
    // })

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module.rule('svg').exclude.add(resolve('src/icons')).end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config.when(process.env.NODE_ENV !== 'development', (config) => {
      config
        .plugin('ScriptExtHtmlWebpackPlugin')
        .after('html')
        .use('script-ext-html-webpack-plugin', [
          {
            // `runtime` must same as runtimeChunk name. default is `runtime`
            inline: /runtime\..*\.js$/
          }
        ])
        .end()
      config.optimization.splitChunks({
        chunks: 'all',
        cacheGroups: {
          libs: {
            name: 'chunk-libs',
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: 'initial' // only package third parties that are initially dependent
          },
          elementUI: {
            name: 'chunk-elementUI', // split elementUI into a single package
            priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
          },
          commons: {
            name: 'chunk-commons',
            test: resolve('src/components'), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true
          }
        }
      })
      // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
      config.optimization.runtimeChunk('single')
    })
  }
}
